I am trying to emboss an image and this is the method I have. For some reason, when I click the emboss button (which calls the following method), nothing happens to my image. Can you see what could be wrong in my method?
Emboss method:
public BufferedImage emboss(BufferedImage bi) {
int width = bi.getWidth();
int height = bi.getHeight();
BufferedImage dst;
dst = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
for (int i = 0; i < height; i++)
for (int j = 0; j < width; j++) {
int upperLeft = 0;
int lowerRight = 0;
if (i > 0 && j > 0)
{
upperLeft = bi.getRGB(j - 1, i - 1);
}
if (i < height - 1 && j < width - 1)
{
lowerRight = bi.getRGB(j + 1, i + 1);
}
int redDiff = ((lowerRight >> 16) & 255) - ((upperLeft >> 16) & 255);
int greenDiff = ((lowerRight >> 8) & 255) - ((upperLeft >> 8) & 255);
int blueDiff = (lowerRight & 255) - (upperLeft & 255);
int diff = redDiff;
if (Math.abs(greenDiff) > Math.abs(diff))
{
diff = greenDiff;
}
if (Math.abs(blueDiff) > Math.abs(diff))
{
diff = blueDiff;
}
int grayColor = 128 + diff;
if (grayColor > 255)
{
grayColor = 255;
}
else if (grayColor < 0)
{
grayColor = 0;
}
int newColor = (grayColor << 16) + (grayColor << 8) + grayColor;
bi.setRGB(j, i, newColor);
}
return dst;
}